Optimal surface for corner combined footings assuming that the ground contact area works partially in compression considering that the maximum pressure is located at one end and on the outer and inner side of the footing: Part 2

This work presents the optimal surface for corner combined footings considering that the contact area with the soil works partially in compression (a part of the contact surface of the footing is subject to compression and the other there is no pressure and neither tensile). The methodology is developed by integration to obtain the resultant force and resultant moments in the X and Y axes that act on the footing due to the soil pressure. The three types that can occur depending on the location of the maximum pressure are: 1) Corner of the footing; 2) At one end and on the outer side of the footing; 3) At one end and on the inner side of the footing. In this work, the simplified equations are shown when the maximum pressure is located at one end and on the outer and inner side of the footing. Some engineers obtain the contact area of the footing by the trial and error method. Other authors present the minimum area for a corner combined footing taking into account that the contact area with the soil works completely in compression. Numerical examples are shown to obtain the minimum area of the footings and the results are compared with the current model. The new model shows a smaller soil contact area in some cases than the current model.